You can enter into a prenuptial agreement in Colombia to protect assets which were acquired in the past, and which will be acquired in the future. Prenuptial agreements can be applied to both civil unions and regular marriages. Even if your assets are not in Colombia, they could be in serious jeopardy in the event of a divorce or liquidation of a Civil Union, so you should strongly consider a prenuptial agreement if foreign assets are a concern.
Please note that after only 2 years of living in the same house as your partner in Colombia, your relationship automatically qualifies as a Civil Union and your partner could be legally entitled to your assets, similar to a regular marriage.
If you have assets and want to protect them, we always recommend to make a prenupial agreement if you plan to marry a Colombian woman.
We can contact you with bilinugal lawyers in Colombia that can assist in making such a prenupial agreement in Spanish.