diff --git a/backend/internal/domain/cropland.go b/backend/internal/domain/cropland.go
new file mode 100644
index 0000000..17a7192
--- /dev/null
+++ b/backend/internal/domain/cropland.go
@@ -0,0 +1,36 @@
+package domain
+
+import (
+	"context"
+	"time"
+
+	validation "github.com/go-ozzo/ozzo-validation/v4"
+)
+
+type Cropland struct {
+	UUID        string
+	Name        string
+	Status      string
+	Priority    int
+	LandSize    float64
+	GrowthStage string
+	PlantID     string
+	FarmID      string
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+}
+
+func (c *Cropland) Validate() error {
+	return validation.ValidateStruct(c,
+		validation.Field(&c.Name, validation.Required),
+		validation.Field(&c.Status, validation.Required),
+		validation.Field(&c.GrowthStage, validation.Required),
+		validation.Field(&c.LandSize, validation.Required),
+	)
+}
+
+type CroplandRepository interface {
+	GetByID(context.Context, string) (Cropland, error)
+	CreateOrUpdate(context.Context, *Cropland) error
+	// Delete(context.Context, string) error
+}
diff --git a/backend/internal/domain/farm.go b/backend/internal/domain/farm.go
new file mode 100644
index 0000000..5bc1154
--- /dev/null
+++ b/backend/internal/domain/farm.go
@@ -0,0 +1,33 @@
+package domain
+
+import (
+	"context"
+	"time"
+
+	validation "github.com/go-ozzo/ozzo-validation/v4"
+)
+
+type Farm struct {
+	UUID      string
+	Name      string
+	Lat       float64
+	Lon       float64
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	OwnerID   string
+}
+
+func (f *Farm) Validate() error {
+	return validation.ValidateStruct(f,
+		validation.Field(&f.Name, validation.Required),
+		validation.Field(&f.Lat, validation.Required),
+		validation.Field(&f.Lon, validation.Required),
+		validation.Field(&f.OwnerID, validation.Required),
+	)
+}
+
+type FarmRepository interface {
+	GetByID(context.Context, string) (Farm, error)
+	CreateOrUpdate(context.Context, *Farm) error
+  // Delete(context.Context, string) error
+}