Seccu
The Seccu River () is a small coastal river in the department of Haute-Corse, Corsica, France. Course The Seccu is long. It crosses the communes of Calenzana, Lumio and Montegrosso. It rises in the commune of Calenzana to the south of the Monte Grosso. At first it flows southwest, but then flows in a generally northwest direction to enter the sea in the Golfe de Calvi. Human impacts In the late 19th century the decline in agriculture led to croplands and pasture being replaced by wild undergrowth and woods, which reduced the amount of erosion and run-off. This in turn led to less sediment being carried to the mouth of the river. In the 1970s in-channel gravel mining began in the river. The gravel pit traps sediment, and has caused braided channels to be replaced by a single channel. An alder forest colonized the gravel pit, trapping most of the sand from the watershed and creating a flood risk. Downstream, the result has been erosion of the beach, which started in the 19th century and is likely to continue for several decades, destroying a tourist attraction. The area around the mouth of the river has been designated a ZNIEFF covering