Consider the following statements with respect to the Coastal Plains of India :

1. The western coast is a narrow belt and provides natural conditions for the development of ports and harbours

2. The Malabar coast has got certain distinguishing features in the form of Kayals, which are used for fishing and inland navigation.

3. The continental shelf on the eastern coast extends up to 500 km into the sea.

Which of the statements given above are correct?