Because Monaco and Gambia are on coast, I think countries like Brunei, Haiti, Dominican republic, Denmark, South Korea, East Timor etc. are on same position. You should also give much less time. 18 sec was enough for me.
Senegal basically wraps around the Gambia, except for one coast. Denmark and the other countries you have listed have more than one side of water available. The time will be lowered to 1 minute.