In the online game PowerPets, crossing South Lake requires a boat. You can find boats at the docks on the east and west sides of the lake. Simply interact with a docked boat to board and navigate across the water.
This mechanic is typical of PowerPets' exploration system, where certain areas are gated behind specific items or vehicles. If you're new to the game, check the dock areas on both shores—boats are usually clearly visible and available for use by any player.