The West Coast Canal or National Waterway No 3 is a 205 km (127 mi) long inland navigational route located in Kerala, India, which runs from Kollam to Kottapuram. It was declared a National Waterway in 1993. In addition to the main stretch, Champakara and Udyogmandal canals are navigable and connect the industrial centers of Kochi to Kochi port Inland Waterways Authority of India (IWAI) under the Ministry of Shipping is coordinating the task for developing, monitoring and administering national waterways. It is the first National Waterway in the country with 24-hour navigation facilities along the entire stretch. It has been extended to Kozhikode by the National Waterways Act, 2016. The National Waterway 3 mainly passes through the previous Thiruvananthapuram–Shoranur canal.

Kollam, also known by its former name Quilon, is an ancient seaport and city on the Malabar Coast of India bordering the Laccadive Sea, which is a part of the Arabian Sea. It is 71 km (44 mi) north of the state capital Thiruvananthapuram. The city is on the banks of Ashtamudi Lake and the Kallada river. Kollam is the fourth largest city in Kerala and is known for cashew processing and coir manufacturing. It is the southern gateway to the Backwaters of Kerala and is a prominent tourist destination. Kollam is one of the most historic cities with continuous settlements in India. Geographically, Quilon formation seen around coastal cliffs of Ashtamudi Lake, represent sediments laid down in the Kerala basin that existed during Mio-Pliocene times.