Tannat cable system is a 2000km subsea cable connecting Uruguay (Maldonado), Brazil (Santos) and Argentina (Las Toninas).

The Tannat cable consists of 6 fiber pairs, with an initial estimated design capacity of 90 Tbps, supplied by Alcatel-Lucent Submarine Networks.

The Tannat consortium comprises Antel Uruguay, Google.

At Santos cable landing station, the Tannat cable system can interconnect with the Monet cable system to Boca Raton in the US and the Junior cable system to Rio de Janeiro.

The segment connecting Santos, Brazil, to Maldonado, Uruguay has been operational since mid-2018.  Google and Antel announced in July 2019 to extended Tannat cable system to the nearby coastal city of Las Toninas in the Buenos Aires province.