Ark Lost Island has different resources ... head to 27.0 Latitude and 41.2 Longitude and dive into the water. This will lead you to an underwater cave entrance. Run towards the end of the cave ...

Chitin is one of the most important resources in Ark Lost Island, used to tame creatures ... The first Chitin farming location is in the cave under the waterfall at 39.8 Latitude and 30.0 ...