Wikipedia: The Rokin is a canal and major street in Amsterdam, Netherlands located in the Centrum borough and Binnenstad neighbourhood. Originally it was part of the river Amstel, and was known then as Ruck-in (from 'inrukken', which means 'to withdraw', as some of the houses on the Amstel had to be shortened to construct the quays there in the 16th century).
This is the easiest and fastest route for a first acquaintance with Amsterdam. Clear descriptions of places are based on a world encyclopedia made by people for people. Nothing more and everything is easy. This feeling gives Amsterdam and this route seems to be so.