east of; and eastward
Attaches to a place name or region to mean 'east of that place' or 'the area to the east'. Used in geographical descriptions, weather forecasts, and formal writing.
Heavy snow is expected in areas east of the Kanto region.
This train does not go east of Tokyo.
Compound of 以 (i, 'from' or 'by means of') and 東 (tō, 'east'). The 以 prefix is used in similar directional suffixes like 以西, 以南, and 以北.