diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..40467ef
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/turbomaps-er
diff --git a/cmd/run.go b/cmd/run.go
index 9337170..14373f1 100644
--- a/cmd/run.go
+++ b/cmd/run.go
@@ -31,9 +31,10 @@ func Run(ctx context.Context) error {
 		} `json:"properties"`
 		Geometry struct {
 			Type        string `json:"type"`
-			Coordinates []any  `json:"coordinates"`
+			Coordinates any    `json:"coordinates"`
 		} `json:"geometry"`
 	}
+	type Area [1][5][2]float64
 	geoJsons := []geoJson{}
 	for _, town := range towns {
 		for search, area := range searches {
@@ -59,7 +60,7 @@ func Run(ctx context.Context) error {
 				if *doArea {
 					a.Geometry.Type = "Polygon"
 					x, y := results[i].Lng, results[i].Lat
-					a.Geometry.Coordinates = []any{[]any{
+					a.Geometry.Coordinates = Area{{
 						[2]float64{x, y + radiusY}, // top
 						[2]float64{x + radiusX, y}, // right
 						[2]float64{x, y - radiusY}, // bot
@@ -78,6 +79,25 @@ func Run(ctx context.Context) error {
 	geoJsons = slices.CompactFunc(geoJsons, func(a, b geoJson) bool {
 		return fmt.Sprint(a.Geometry.Coordinates) == fmt.Sprint(b.Geometry.Coordinates)
 	})
+	if *doArea {
+		for i := 0; i < len(geoJsons); i++ {
+			areaI := geoJsons[i].Geometry.Coordinates.(Area)[0]
+			j := i + 1
+			for j < len(geoJsons) {
+				areaJ := geoJsons[j].Geometry.Coordinates.(Area)[0]
+				// if diamond i contains j, then drop j
+				iAbove := areaI[0][1] > areaJ[0][1]
+				iRight := areaI[1][0] > areaJ[1][0]
+				iBelow := areaI[2][1] < areaJ[2][1]
+				iLeft := areaI[3][0] < areaJ[3][0]
+				if iAbove && iRight && iBelow && iLeft {
+					geoJsons = append(geoJsons[:j], geoJsons[j+1:]...)
+				} else {
+					j += 1
+				}
+			}
+		}
+	}
 	log.Println("COMPACTED", len(geoJsons))
 	b, _ := json.Marshal(map[string]any{
 		"features": geoJsons,