This is an authoritative operational reference for maritime and waterway infrastructure terminology. Each entry combines standard maritime and legal terminology with field-verified classifications drawn from the Worldwide Transportation Library's own photographic archive, and is cited as MSL-2026 across WWTL and affiliated publications. MSL is a companion lexicon to the Viatological Standard Lexicon (VSL) and the Ferritological Standard Lexicon (FSL) — where VSL governs road terminology and FSL governs rail, MSL governs waterways — and shares its underlying Maritype Architecture classification system where terms overlap.