Bashir made the declaration in the North Darfur state capital El Fasher at a ceremony attended by Qatari emir Sheikh Tamim bin Hamad al-Thani and Chadian President Idriss Deby.
Qatar has hosted successive rounds of peace talks between the Arab-dominated Khartoum government and the ethnic minority rebels who took up arms in 2003 against Bashir's administration.
Talks in Doha in 2011 led to a peace deal with one small rebel faction -- the Liberation and Justice Movement -- and Wednesday's ceremony marked its implementation.
"Darfur is better today than yesterday. And tomorrow it will be even better."
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Bashir, who vowed to develop the strife-torn region, stopped short of outright declaring an end to a 13-year conflict in Darfur.
"We will build roads and better education, health, water and electricity facilities... We will also undertake reconciliation among all Darfur tribes," Bashir said to supporters' cheers.
Many in the crowd carried pictures of Bashir and the Qatari emir.
Khartoum has repeatedly sought to declare an end to the conflict in Darfur this year, claiming that an April referendum backing the current five-state division of the region turned the page.
Khartoum had strongly opposed the extension but the Security Council said that persistent fighting between government forces and the rebels continues to drive thousands of civilians from their homes.
Up to 194,000 civilians have been displaced from the Jebel Marra area since mid-January, the UN said last week, adding to hundreds of thousands of displaced people already living in camps.
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