 The coastline has rocky bays and sea cliffs, but is dominated by long stretches of low sand dunes and beaches sloping into the Black Sea.The sea has a moderating effect on the climate, so temperatures do not fall much below in winter, and are not as high in the summer as in area further inland.The Kaliakra cliffs in the north of Bulgaria are rich in flora, including many species in common with the neighboring Steppic and Mediterranean Regions.