diff --git a/src/DataTableModel.java b/src/DataTableModel.java
index 5da36af..626a4f6 100644
--- a/src/DataTableModel.java
+++ b/src/DataTableModel.java
@@ -267,4 +267,55 @@ public class DataTableModel extends AbstractTableModel {
 
         return harvestData;
     }
+
+    public RectangleArea findSmallestSectorWithVariety(int variety) {
+        RectangleArea smallestArea = null;
+
+        for (int row = 0; row < getRowCount(); row++) {
+            for (int col = 0; col < getColumnCount(); col++) {
+                RectangleArea spotSmallestArea = getSmallestAreaWithVarietyForSpot(col, row, variety);
+
+                if (smallestArea == null || (spotSmallestArea != null && spotSmallestArea.area < smallestArea.area)) {
+                    smallestArea = spotSmallestArea;
+                }
+            }
+        }
+
+        return smallestArea;
+    }
+
+    private RectangleArea getSmallestAreaWithVarietyForSpot(int x, int y, int targetVariety) {
+        RectangleArea smallestArea = null;
+
+        int maxHeight = getRowCount() - y;
+        int maxWidth = getColumnCount() - x;
+
+        for (int height = 1; height <= maxHeight; height++) {
+            for (int width = 1; width <= maxWidth; width++) {
+                RectangleArea rectangle = new RectangleArea(x, y, width, height);
+                int uniqueTreesAmount = getRectangleUniqueTreesAmount(rectangle);
+
+                if (uniqueTreesAmount != targetVariety) {
+                    continue;
+                }
+
+                if (smallestArea == null || rectangle.area < smallestArea.area) {
+                    smallestArea = rectangle;
+                }
+            }
+        }
+
+        return smallestArea;
+    }
+
+    private int getRectangleUniqueTreesAmount(RectangleArea rectangle) {
+        Set<String> uniqueTrees = new HashSet<>();
+        for (int row = rectangle.y; row < rectangle.y + rectangle.height; row++) {
+            for (int col = rectangle.x; col < rectangle.x + rectangle.width; col++) {
+                uniqueTrees.add(rowData[row][col].getTree());
+            }
+        }
+
+        return uniqueTrees.size();
+    }
 }
diff --git a/src/IndexValidator.java b/src/IndexValidator.java
index ccf8e36..82fa6ae 100644
--- a/src/IndexValidator.java
+++ b/src/IndexValidator.java
@@ -29,7 +29,7 @@ public class IndexValidator {
 
         // Error: resulting index is negative
         if (inputRow <= 0) {
-            String message = String.format("Невозможно нийти строчку %d: номер должен быть больше 0", inputRow);
+            String message = String.format("Невозможно найти строчку %d: номер должен быть больше 0", inputRow);
             JOptionPane.showMessageDialog(null, message, "Неправильный индекс строчки", JOptionPane.ERROR_MESSAGE);
             return -1;
         }
diff --git a/src/MenuActionFindSmallestSector.java b/src/MenuActionFindSmallestSector.java
new file mode 100644
index 0000000..4dbce4d
--- /dev/null
+++ b/src/MenuActionFindSmallestSector.java
@@ -0,0 +1,80 @@
+import javax.swing.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class MenuActionFindSmallestSector implements ActionListener {
+    private DataTableModel tableModel;
+
+    public MenuActionFindSmallestSector(DataTableModel tableModel) {
+        this.tableModel = tableModel;
+    }
+
+    public void actionPerformed(ActionEvent e) {
+        System.out.println("Find smallest sector");
+
+        Object[] options = {"Поиск", "Отмена"};
+
+        JPanel panel = new JPanel();
+        panel.add(new JLabel("Введите число k"));
+
+        JTextField textField = new JTextField(10);
+        panel.add(textField);
+
+        int variety = -1;
+        while (variety == -1) {
+            int result = JOptionPane.showOptionDialog(
+                    null,
+                    panel,
+                    "Введите число k",
+                    JOptionPane.YES_NO_OPTION,
+                    JOptionPane.PLAIN_MESSAGE,
+                    null,
+                    options,
+                    null
+            );
+
+            // Canceled by user
+            if (result == JOptionPane.CLOSED_OPTION || result == 1) {
+                return;
+            }
+
+            int inputVariety;
+            // Check for validity of input data (should be a number)
+            try {
+                inputVariety = Integer.parseInt(textField.getText());
+            } catch (NumberFormatException error) {
+                // Error: empty input field / input not a number
+                String message = "Пожалуйста введите правильное число";
+                JOptionPane.showMessageDialog(null, message, "Неправильное число", JOptionPane.ERROR_MESSAGE);
+                continue;
+            }
+
+            // Error: resulting number is negative
+            if (inputVariety <= 0) {
+                String message = String.format("Невозможно найти сектор с k=%d: номер должен быть больше 0", inputVariety);
+                JOptionPane.showMessageDialog(null, message, "Неправильное число", JOptionPane.ERROR_MESSAGE);
+                continue;
+            }
+
+            variety = inputVariety;
+        }
+
+        RectangleArea smallestSector = tableModel.findSmallestSectorWithVariety(variety);
+
+        // Check if operation is successful
+        if (smallestSector != null) {
+            String message = String.format(
+                    "Площадь: %d\nЛевая верхняя область: x=%d, y=%d\nПравая нижняя область: x=%d, y=%d",
+                    smallestSector.area,
+                    smallestSector.x + 1,
+                    smallestSector.y + 1,
+                    smallestSector.x + smallestSector.width,
+                    smallestSector.y + smallestSector.height
+            );
+            JOptionPane.showMessageDialog(null, message);
+        } else {
+            String message = String.format("Не удалось найти сектор с k=%d", variety);
+            JOptionPane.showMessageDialog(null, message, "Неудача", JOptionPane.ERROR_MESSAGE);
+        }
+    }
+}
diff --git a/src/MenuBar.java b/src/MenuBar.java
index 090e16c..7f0ccde 100644
--- a/src/MenuBar.java
+++ b/src/MenuBar.java
@@ -66,7 +66,10 @@ public class MenuBar extends JMenuBar {
         linSpecItem.addActionListener(new MenuActionLinSpec());
         menu.add(linSpecItem);
 
-        menu.add(createMockMenuItem("Сектор К деревьев"));
+        JMenuItem sectorItem = new JMenuItem("Сектор K деревьев");
+        sectorItem.addActionListener(new MenuActionFindSmallestSector(tableModel));
+        menu.add(sectorItem);
+
         this.add(menu);
     }
 
diff --git a/src/RectangleArea.java b/src/RectangleArea.java
new file mode 100644
index 0000000..f9ef421
--- /dev/null
+++ b/src/RectangleArea.java
@@ -0,0 +1,15 @@
+public class RectangleArea {
+    public int x;
+    public int y;
+    public int width;
+    public int height;
+    public int area;
+
+    public RectangleArea(int x, int y, int width, int height) {
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+        this.area = width * height;
+    }
+}