Answer:
Coastal cities are located on the interface or transition areas between land and sea, including large inland lakes. Usually, coastal cities have access to the sea or larger lakes through ports and/or major rivers.
Step-by-step explanation:
1.Kiswahili was used as the main medium of communication in the coastal towns.
2.Islam was the main religion practiced in the towns.
3.Islamic law/Sharia was used in administration.
4.Houses were constructed using Arabic architecture.
5.Trade was the main economic activity in the towns.
6.In the city states were generally divided into two sections, one Muslim and other African.
7.The city states were ruled by Imams/Sultans/sheikhs.
:-befrank