Where are most gasoline and propane fumes most likely to accumulate in the boat?

Most gasoline and propane fumes are likely to accumulate in the lower areas of the boat, particularly in the bilge or any enclosed spaces where air circulation is limited. These fumes are heavier than air, causing them to settle in these low-lying areas. It's crucial to ensure proper ventilation and regularly check for leaks to prevent dangerous buildup. Always keep ignition sources away from these areas to minimize the risk of fire or explosion.