SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/boat-bilge-lowest

What is the lowest part of the inside of a boat called?

The bilge.

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  1. The bilge ✔
  2. The transom
  3. The gunwale

Why: The bilge is the lowest space inside the hull, where water and fuel vapors collect. That is why boats have bilge pumps and why you run the blower before starting a gas inboard.

Huh, didn't know that: Keeping bilges clean is part of keeping a boat in top operating condition.

The dad joke
Why did the bilge pump get a promotion? It was great at bailing people out.
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References

Answer: The bilge. The bilge is the lowest space inside the hull, where water and fuel vapors collect. That is why boats have bilge pumps and why you run the blower before starting a gas inboard.

  1. Oregon State Marine Board Nautical Term Glossary www.oregon.gov/osmb/boater-info/pages/nautical-term-glossary.aspx
    BILGE - Lower internal part of a boat's hull.
    Checked 2026-10-09.
  2. USCG, A Boater's Guide to the Federal Requirements for Recreational Boats www.uscgboating.org/assets/1/AssetManager/Boaters-Guide-to-Federal-Requirements-for-Receational-Boats-20231108.pdf
    Gasoline vapors can explode. Before starting engine, operate blower at least four minutes and check the engine compartment bilge for gasoline vapors.
    Checked 2026-10-09.
  3. USCG, A Boater's Guide to the Federal Requirements for Recreational Boats www.uscgboating.org/assets/1/AssetManager/Boaters-Guide-to-Federal-Requirements-for-Receational-Boats-20231108.pdf
    Make sure your boat is in top operating condition. It should be free of tripping hazards, fire hazards, and have clean bilges.
    Checked 2026-10-09.

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