The line joining the areas having the same rainfall is called

The correct answer is Isohyet.
-An isohyet line is a line joining points of equal rainfall on a map in a given period. A map with isohyets is called an isohyetal map.

🔴Additional Information:
-Isobar is a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
-Isotherm, a line is drawn on a map or chart joining points with the same temperature. Isotherms are commonly used in meteorology to show the distribution of temperature at the Earth’s surface or on a chart indicating constant level or constant pressure.
-Isotherm is also used to show the time variation of temperature with height in the atmosphere or with depth in soil or water and the characteristics of heat flow into the soil.
-Isohaline is a line or surface drawn on a map or chart to indicate connecting points of equal salinity in the ocean.
-Isohaline position refers to the distance (kilometers) of a near-bottom isohaline from the mouth of a coastal waterway.