It covers an area of 800 square kilometres and stretches from the beautiful, lush green coastal mangroves lining the shores of the Persian Gulf, inland across the rolling sand dunes to the fertile oasis surrounding Falaj Al Moalla.
The inland oasis and hinterland town of Falaj Al Moalla lies some 50km from Umm Al Quwain city.
The name Umm Al Quwain is derived from Umm Al Quwatain, which means "Mother of two powers", a reference to the powerful seafaring tradition of this emirate.
Khawr Umm al Qaywayn is an inlet comprising an extensive backwater in which are several low islets. Extensive banks, with drying patches, extend seaward from Jazirat as Siniyah and from the peninsula of Umm al Qaywayn.
Between these two banks is a narrow channel leading to Khawr Umm al Qaywayn. It is entered between the W extremity of Jazirat as Siniyah and the peninsula of Umm al Qaywayn.
Jazirat Mallah, separated from Jazirat Siniyah by salt pans covered at HW, extends 5 miles NE. Burj Mallah, the SW of two conspicuous rectangular towers, stands near the SW end of Jazirat Mallah. A dangerous wreck lies 7 miles N of the entrance to Khawr Umm al Qaywayn.