Ryōtsu, Niigata
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Ryōtsu (両津市; -shi) was a city located in Niigata Prefecture, Japan.
In the year 2003, the city had an estimated population of 16,710 and a density of 71.60 persons per km². The total area was 233.37 km².
The city was founded on November 3, 1954. It merged with the rest of Sado Island to form Sado City on March 1, 2004.