What part of the boat is gasoline and propane fumes most likely to accumulate?

Gasoline and propane fumes are most likely to accumulate in low-lying areas of the boat, such as the bilge or cockpit, as these gases are heavier than air. Additionally, enclosed spaces with poor ventilation, like storage compartments or the engine room, can also trap these fumes. Proper ventilation and regular checks are essential to prevent dangerous buildup and ensure safety on board.