Simalthu is a village in the Surat district of Gujarat, India. It is 20 kilometres (12 mi) north of Surat and is known for its involvement with cultivation of sugar and rice, and for its small businesses such as workshops and small shops. Simalthu is a village in the Surat district of Gujarat, India. It is 20 kilometres (12 mi) north of Surat and is known for its involvement with cultivation of sugar and rice, and for its small business such as workshops and small shops.