diff --git a/src/tgp.cpp b/src/tgp.cpp
index af79e8d54d..b4d1aa30c2 100644
--- a/src/tgp.cpp
+++ b/src/tgp.cpp
@@ -725,7 +725,7 @@ static void HeightMapCoastLines(uint8 water_borders)
 		if (HasBit(water_borders, BORDER_NE)) {
 			/* Top right */
 			max_x = abs((perlin_coast_noise_2D(_height_map.size_y - y, y, 0.9, 53) + 0.25) * 5 + (perlin_coast_noise_2D(y, y, 0.35, 179) + 1) * 12);
-			max_x = max((smallest_size * smallest_size / 16) + max_x, (smallest_size * smallest_size / 16) + margin - max_x);
+			max_x = max((smallest_size * smallest_size / 64) + max_x, (smallest_size * smallest_size / 64) + margin - max_x);
 			if (smallest_size < 8 && max_x > 5) max_x /= 1.5;
 			for (x = 0; x < max_x; x++) {
 				_height_map.height(x, y) = 0;
@@ -735,7 +735,7 @@ static void HeightMapCoastLines(uint8 water_borders)
 		if (HasBit(water_borders, BORDER_SW)) {
 			/* Bottom left */
 			max_x = abs((perlin_coast_noise_2D(_height_map.size_y - y, y, 0.85, 101) + 0.3) * 6 + (perlin_coast_noise_2D(y, y, 0.45,  67) + 0.75) * 8);
-			max_x = max((smallest_size * smallest_size / 16) + max_x, (smallest_size * smallest_size / 16) + margin - max_x);
+			max_x = max((smallest_size * smallest_size / 64) + max_x, (smallest_size * smallest_size / 64) + margin - max_x);
 			if (smallest_size < 8 && max_x > 5) max_x /= 1.5;
 			for (x = _height_map.size_x; x > (_height_map.size_x - 1 - max_x); x--) {
 				_height_map.height(x, y) = 0;
@@ -748,7 +748,7 @@ static void HeightMapCoastLines(uint8 water_borders)
 		if (HasBit(water_borders, BORDER_NW)) {
 			/* Top left */
 			max_y = abs((perlin_coast_noise_2D(x, _height_map.size_y / 2, 0.9, 167) + 0.4) * 5 + (perlin_coast_noise_2D(x, _height_map.size_y / 3, 0.4, 211) + 0.7) * 9);
-			max_y = max((smallest_size * smallest_size / 16) + max_y, (smallest_size * smallest_size / 16) + margin - max_y);
+			max_y = max((smallest_size * smallest_size / 64) + max_y, (smallest_size * smallest_size / 64) + margin - max_y);
 			if (smallest_size < 8 && max_y > 5) max_y /= 1.5;
 			for (y = 0; y < max_y; y++) {
 				_height_map.height(x, y) = 0;
@@ -758,7 +758,7 @@ static void HeightMapCoastLines(uint8 water_borders)
 		if (HasBit(water_borders, BORDER_SE)) {
 			/* Bottom right */
 			max_y = abs((perlin_coast_noise_2D(x, _height_map.size_y / 3, 0.85, 71) + 0.25) * 6 + (perlin_coast_noise_2D(x, _height_map.size_y / 3, 0.35, 193) + 0.75) * 12);
-			max_y = max((smallest_size * smallest_size / 16) + max_y, (smallest_size * smallest_size / 16) + margin - max_y);
+			max_y = max((smallest_size * smallest_size / 64) + max_y, (smallest_size * smallest_size / 64) + margin - max_y);
 			if (smallest_size < 8 && max_y > 5) max_y /= 1.5;
 			for (y = _height_map.size_y; y > (_height_map.size_y - 1 - max_y); y--) {
 				_height_map.height(x, y) = 0;