Remove "excess" after applying kriging interpolation

Discussion created by emmalgale on Oct 18, 2012
Latest reply on Oct 19, 2012 by emmalgale
Apologies if this is not the correct place, or if this has been answered before, but I am new to ArcGIS so struggling a bit.

I have points with precipitation values, and I have applied kriging from the interpolation tools so that I have an interpolated precipitation surface for Thailand.

However, this has been done to a rectangle about the same size as Thailand, so includes areas that are ocean/other countries that I am not interested in.

Is there a way to only display the interpolation within Thailand?

I have (hopefully attached the example of the current map I have). I want to have everything inside the black line depicting the border or Thailand.

Thanks in advance! (Also, I am very new to all of this, and teaching myself, so please explain things in a very basic step-by-step way).