Question

the middle part of the western coastal plain is

Answer 1

The answer of your question is "Kanara"
 The western coastal plains are actually located between the western ghats and the arabian sea . This area starts from gujarat and  goes towards the kerala.
It is divided in to three sections . The southern part of the coast is recognized as the Malabar coast , other is northern part  which is also called "konkan" . And the central stretch is known as the "Kanara".

Hope this will helps.

Answer 2

The Western Coastal Plain is 50 km wide and lies between the Western Ghats hills and the west coast of India. The plains are situated between the Arabian Sea and the Western Ghats. They extend from Gujarat in the north to Kerala in the south. They pass through the states of Karnataka, Goa and Maharashtra.

It consists of three sections:

1. The northern part is called the Konkan (Mumbai-Goa).

2. The central part is called the Kanara.

3. The southern part is referred to as the Malabar Coast.