The blasts in mostly government-held territory killed at least 48 people and wounded dozens more, a day after the jihadist group lost the last stretch of the Syria-Turkey border under its control.
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The Islamic State said that it was behind the Hassakeh attack, which allegedly targeted Kurdish militants, but there have been no immediate claims of responsibility for the blasts in three other areas.
The apparently orchestrated attacks were rare for their scope, shaking the regime-controlled capital Damascus, the western cities Homs and Tartous and a Kurdish area in eastern Hasakah province.
The residents of the al-Zahraa neighbourhood are mostly Alawite, the same sect as al-Assad.
The coastal city is a popular beach resort among Syrians, with many coming from government controlled areas, particularly ahead of a major Muslim holiday next week.
Tartus is the second-largest port city in Syria.
Amaq said in a statement that a bomber wearing a suicide belt had attacked an Asayesh checkpoint there.
Turkey began an operation inside Syria on 24 August targetting not only IS but also Syrian Kurdish forces that have been a key United States partner in the fight against the jihadist group in Syria.
Series of blasts hit Syrian government areas and a Kurdish region on Monday, killing 47 people, a monitoring group said, as the USA and Russian Federation failed to agree on a way to end the violence.
A motorbike also exploded in the centre of the northeastern city of Hasaka, which is controlled by the Kurdish YPG militia.
Those explosions killed at least 11 people and wounded 45, a source in the Tartous police told SANA. ISIL said a suicide auto bomb targeted a military checkpoint in the area west of Damascus.
A auto bomb struck a bridge on the global coastal highway leading to the government stronghold of Tartus.
BEIRUT/HANGZHOU, China, Sept 5 (Reuters) – The United States and Russian Federation will work in the next few days on a deal to curb fighting in Syria and build cooperation in the fight against terrorism, their leaders said on Monday, as blasts claimed by Islamic State killed dozens across the Arab nation.
Government troops withdrew from Hasakeh in August after street battles with Kurdish forces, which took control of the city, although the police force stayed in place.
Details about the locations of the explosions and the casualties are unfolding.
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More than 290,000 people have been killed in Syria since its conflict erupted in March 2011 and millions more have been displaced by the fighting.
