The Hindu king of those days giving the Kulen river originating from Mahendraparvat (ancient city of Cambodia) the status of river Ganga with the aim of giving his subjects water like the pure Ganga and making the soil fertile by sculpting 1000 Shivalingas in the river bed
The Kambhoj desh referred to in the Mahabharat is the Cambodia of today. Hindus have been inhabiting it since the 17th century.