While Okitsugu TANUMA carried out reclamation works for the Inba-numa and the Tega-numa lakes, he planned the development of Ezochi (inhabited area of Ainu) and the trade with Russia.
田沼意次は印旛沼・手賀沼干拓を実施し、蝦夷地開発や対ロシア貿易を計画する。