Ems-Occidental was a department of the First French Empire in the present-day Netherlands and Germany. It was named after the river Ems. It was formed in 1810, when the Kingdom of Holland was annexed by France. Its territory corresponded more or less with the present Dutch provinces of Groningen and Drenthe. Its capital was Groningen. The department was subdivided into the following arrondissements and cantons :
After Napoleon was defeated in 1814, the department became part of the United Kingdom of the Netherlands, except the canton of Jemgum and most of Weener, which became part of the Kingdom of Hanover .
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