Question

What do you mean by landlocked ports??
What do you mean by riverine ports?

Answer 1

The Port of Kolkata is a riverine port in the city of Kolkata, India, located around 203 kilometres (126 mi) from the sea.[7] It is the oldest operating port in India, and was constructed by the British East India Company.

Port of Kolkata

Khidirpore Dock of Kolkata Port

LocationCountry IndiaLocationKolkata, West Bengal, IndiaDetailsOpened1870; 148 years agoOperated byKolkata Port TrustOwned byKolkata Port Trust, Ministry of Shipping, Government of IndiaType of harborCoastal breakwater, riverine, large seaportAvailable berths28 (Kolkata)
12 (Haldia)Wharfs86Main tradesAutomobiles, motorcycles and general industrial cargo including iron ore, granite, coal, fertilizers, petroleum products, and containers
Major exports: Iron ore, leather, cotton textiles
Major imports: Wheat, raw cotton, machinery, iron & steelStacking area134722 sqm

Answer 2

Landlocked means enclosed in all sides by land... Hence, there is no landlocked port in India. However, if you meant which is the deepest port in India, it is Vishakapatnam, which is naturally deep and hence, called a natural harbour.

There are some ports which are located farther away from the coast and relatively inland. These ports are known as Riverine ports.