How to destroy ant colony without using chemicals?

I did it by vacuumed it all out! See the enormous amount of ants and eggs hidden under the wood deck.

Gemia Island, Terengganu

Gemia Island is about 15 mins boat ride from Marang jetty. It is a secluded island with crystal clear water and all sorts of sea creatures that you can snorkel along the shore to explore. Though beware that sea urchins are abundant especially during low tide in the late afternoon. It is an excellent island for snorkeling, kayaking and rock climbing. Service and food at Gem Island Resort is good, staff are friendly.

Gem Island Resort

Baby turtles are protected inside the pool at Gem island resort

Baby crown fish hiding in the purple coral

Corals expose out of the water during low tide.

Sea cucumber hiding around the rock.