What's the best island for Wheat Fields and Sugarcane Rows?

Was wondering this because I recently maximized the profit I could make off of Cassia Bay’s Sugarcane Rows, which is a paltry 5,100 Galleons per harvest. Granted, Wheat Fields can’t be placed on that island because it’s all sand, but it did make me wonder what the best spots are for passive Galleons.

I’ve heard that it was Shale Reef, but it needs confirmation (although it would check-out as it’s pretty large and has access to wheat fields).

At shale reef with like max farms I can get 13-15k and like once 17k? per harvest (depends on if the sugarcane is synced up) but that’s with like 4 line things of wheat out of range (so like -240$)