Rio Bravo Oil (SDGU) S-1 IPO registration

Exhibit  3.1

CORPORATE CHARTER

I, ROSS MILLER, the duly elected and qualified Nevada Secretary of State, do hereby certify thatSOTON HOLDINGS GROUP, INC., did on June 9, 2010, file in this office the original Articles of Incorporation; that said Articles of Incorporation are now on file and of record in the office of the Secretary of State of the State of Nevada, and further, that said Articles contain all the provisions required by the law of said State of Nevada.

	IN WITNESS WHEREOF, I have hereunto set my hand and affixed the Great Seal of State, at my office on June 9, 2010. ROSS MILLER Secretary of State
Certified By: G Ramos Certificate Number: C20100609-1410 You may verify this certificate online athttp://www.nvsos.gov/