So, I have a portfolio and I don't understand the questions.

My rivers/valleys are the Nile river and Mesopotamia.

1. In what present-day countries can the sites of your civilizations be found?

https://www.google.com/search?q=Where+are+Nile+Tigris+Euphrates+rivers&oq=Where+are+Nile+Tigris+Euphrates+rivers&aqs=chrome..69i57.12601j0j7&sourceid=chrome&ie=UTF-8

Once you've read through a few of the search results here, click on Maps at the top of the screen and their locations will be clear.

Well, my directions didn't work very well!

Nile — https://www.google.com/maps/search/Where+are+Nile+Tigris+Euphrates+rivers/@30.5409112,35.4360103,5z

Tigris — https://www.google.com/maps/place/Tigris/@34.6406679,39.3171378,6z/data=!3m1!4b1!4m5!3m4!1s0x3fe7a50d353471ef:0x9fa8d81e43060351!8m2!3d34.7229918!4d43.6698811

Euphrates — https://www.google.com/search?q=euphrates+river&oq=euphrates+river&aqs=chrome..69i57j69i60l3.3641j0j7&sourceid=chrome&ie=UTF-8

To determine the present-day countries where the sites of your civilizations can be found, you need to do some research and consider a few factors. Here are the steps you can follow to find the answer to your question:

1. Start by researching the location of the Nile River civilization. The ancient Egyptian civilization was primarily located along the banks of the Nile River in northeastern Africa. It covered the territory that is now Egypt.

2. Research the location of Mesopotamia. Mesopotamia was an ancient civilization located in the region of the Tigris and Euphrates rivers, which are located in modern-day Iraq. However, the extent of Mesopotamian civilization expanded beyond present-day Iraq and included parts of Syria and Turkey as well.

3. With the research from step 1 and 2, you now have the basic information about the locations of the Nile River and Mesopotamian civilizations.

4. Based on your research, you can conclude that the sites of your civilizations can be found in the following present-day countries:

- Nile River: Egypt
- Mesopotamia: Iraq, parts of Syria and Turkey

Remember to double-check your research and verify the information from reliable sources such as history books or reputable websites to ensure accuracy.