River Thames shipping coming in and out of London, in 1732 it received the world's first lightship. This became a major landmark, and was used as an assembly point for shipping. Today it is marked by Sea Reach No. 1 Buoy. The River Thames contains over 80 islands ranging from the large estuarial marshlands of the Isle of Sheppey and Canvey Island to small tree-covered islets like Rose Isle in Oxfordshire and Headpile Eyot in Berkshire. They are found all the way from the Isle of Sheppey in Kent to Fiddler's Island in Oxfordshire. Some of the largest inland islands, for example
River, Estuary and Coastal Observing Network River, Estuary and Coastal Observing Network The River, Estuary, and Coastal Observing Network (RECON) is a pioneering waterway observing system founded and maintained by Sanibel-Captiva Conservation. RECON is funded primarily by private donations to SCCF's Marine Laboratory. Seven fixed locations stream water quality data from in situ Satlantic instrument packages. The sensor array includes a chemical-free nitrate sensor (ISUS), a CTD (conductivity, temperature, and depth) and fluorometer package for depth, turbidity, temperature, dissolved oxygen, salinity, and chlorophyll a fitted with a bleach injection system (WETLabs, Water Quality Monitor), and a CDOM fluorometer. One of the stations also incorporates a Nortek