US hotel giant Marriott announced on Wednesday it had finalised a deal to buy the South African-headquartered Protea group, Africa's largest hotel chain, for $186 million. "Marriott and Protea plan to close the transaction on April 1, 2014," the firm said in a statement. The Protea has a high profile in South Africa and in total has 116 hotels and 10,148 rooms in seven African countries. The purchase is subject to regulatory approval.