> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Passive Region Constraint

Define an FE Region to maintain unaltered during the optimization process.

### Inputs

| Name   | Type                                                   | Description          |
| ------ | ------------------------------------------------------ | -------------------- |
| Region | [Region](../../../../block-documentation/types/region) | Region to be frozen. |

### Outputs

| Type                                                                         |
| ---------------------------------------------------------------------------- |
| [Design Constraint](../../../../block-documentation/types/design-constraint) |