What is the name of the northern part of the western coastal plain between Mumbai and Goa?

The correct answer is Konkan coast.

To understand the geography of India's western coastal plain, we can divide it into three distinct sections from north to south:
1. Konkan Coast: This is the northern segment of the western coastal plain. It stretches from Daman in the north down to Goa, passing through Mumbai. Therefore, the northern part of the western coastal plain between Mumbai and Goa is called the Konkan coast.
2. Kannad Plain (or Karavali): This is the central stretch of the western coast, situated primarily along the state of Karnataka.
3. Malabar Coast: This is the southern stretch of the western coastal plain, extending from Mangalore in Karnataka down to Kanyakumari at the southern tip of India, mostly along Kerala.

Meanwhile, the Coromandel coast refers to the southern part of India's eastern coastal plain, primarily along Tamil Nadu, facing the Bay of Bengal.