Indonésia, the biggest archipelago, is a quite a big country, stretching from South-East Asia and Australia. About 5 000 km from East to West and 1 770 km North-South.
And you have incredible dive sites all over the country on the multiple islands.
Bali, one of many islands in Indonesia. Quite small in size ( 140 km East-west and 80km North-South).
But very rich above the ground as well as under the sea.