What Is a Human-Made Channel for Shipping Called?

A **canal** is an **artificial waterway** constructed to allow **watercraft to travel between bodies of water** that are not naturally connected, or to **bypass unnavigable sections** of natural rivers.

Key Features

• Engineered Channel: Excavated, lined (clay, concrete, steel), graded for consistent depth/width.
• Water Supply: Fed by **rivers, reservoirs, pumps, or locks** from higher sources.
• Locks: **Chambers with gates** that raise/lower vessels between different water levels (essential for crossing watershed divides).
• Towpaths / Modern Propulsion: Historically **horse/mule towed**; now **self-propelled (diesel/electric)** or **tug-assisted**.
• Crossings: **Bridges (fixed, lift, swing), tunnels, aqueducts** (canal over river/valley).

Types

• Navigation Canals: **Suez, Panama, Erie, Kiel, Corinth, Grand Canal (China), Amsterdam-Rhine, Volga-Don** — for **shipping/trade**.
• Irrigation Canals: **Deliver water to farms** (e.g., California Central Valley, Indus Basin, Murray-Darling).
• Drainage Canals: **Remove excess water** (Fens/UK, Netherlands polders, Florida Everglades).
• Power Canals: **Feed hydro turbines** (Niagara, Lauffen).
• Hybrid: Most serve multiple purposes (navigation + irrigation + drainage + recreation).

Open vs. Closed

• Open Canal: **Exposed to air** (standard).
• Closed Canal / Tunnel / Pipeline: **Covered** (aqueducts, penstocks, urban culverts). Not typically for navigation.

Impact

Canals **reshape geography, trade, settlement, and geopolitics**. **Suez (1869)** cut Europe–Asia distance **~6,000 km**. **Panama (1914)** avoided **Cape Horn (13,000 km)**. **Erie (1825)** opened **Great Lakes to NYC**, making **New York the empire state**. They remain **critical infrastructure**—**90% of global trade by volume** moves by sea; canals are the **choke points**.