# Argument Region for int2d function
**URL:** https://community.freefem.org/t/argument-region-for-int2d-function/3911
**Category:** General Discussion
**Created:** [May 12, 2025, 8:29am UTC](https://community.freefem.org/t/argument-region-for-int2d-function/3911 "2025-05-12T08:29:11Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@dominiquebodin](https://community.freefem.org/u/dominiquebodin)
#### Post date: [May 12, 2025, 8:29am UTC](https://community.freefem.org/t/argument-region-for-int2d-function/3911/1 "2025-05-12T08:29:11Z")
Dear all,
I’m creating a 3D mesh using a geo file from Gmsh. Some labels (integer numbers) defines the boundary surfaces, and it works fine for Dirichlet condition with solve:on(label,condition).
For Neumann condition, I would like to use the argument Region of the int2d function:
int2d(Th, Region) ()
Apparently, the label from Gmsh cannot be used directly since it creates an error.
Thus my question, how to create a Region from a surface defined by a label out of Gmsh.
Thanks for your support
Dominique
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### Author:  [@dominiquebodin](https://community.freefem.org/u/dominiquebodin)
#### Post date: [May 13, 2025, 3:13pm UTC](https://community.freefem.org/t/argument-region-for-int2d-function/3911/3 "2025-05-13T15:13:23Z")
sorry, the error was due to badly written function in int2d function.
sorry again for the inconvenience