Input (grade 13): Other significant rivers include the River Aeron which has its estuary at Aberaeron, the River Ystwyth and the River Rheidol both of which reach the sea in Aberystwyth harbor.
Output (grade 8): It has a long coastline and several rivers such as the River Teifi, the River Aeron, the River Rheidol and the River Ystwyth. Large towns include Aberystwyth, Lampeter, Aberaeron and Cardigan.