Uruguay is small but it's got plenty of Atlantic coastline. Its oldest city is Colonia de Sacramento on the Río de la Plata settled in 1680 by the Portuguese, a short boat ride from Buenos Aires. The largest city (and also the southernmost capital in South America) is Montevideo.
There are lots of cultural similarities between Uruguay and Argentina, especially in the river basin area, so much so that there's an adjective the describe the culture and people -- Rioplantense. The country celebrates Carnaval for a full 40 days, longer than Brazil's, if more low key.
Matador's got articles about the food, destinations both popular and less well-known, the culture and even volunteering. For all our content on Uruguay, check out the articles below.