A ship loaded with 200 tonnes of humanitarian aid for Palestinians in war-ravaged Gaza left from Cyprus's Larnaca port on Tuesday, a spokeswoman for the NGO operating the vessel said.

"They have left," Laura Lanuza from Spanish charity Open Arms told AFP. The tow boat and barge embarked on the journey at around 0650 GMT, the first such shipment along a maritime corridor from Cyprus aimed at carrying aid to desperate Palestinian civilians in Gaza.

With the volume of aid entering Gaza by land far below pre-war levels and aid agencies warning of famine, foreign governments including Washington have turned to airdrops and are now also trying to set up a maritime aid corridor.

Open Arms is partnered by American charity World Central Kitchen, with the two operating the first shipment on Tuesday.

The aid despatched for Gaza includes "rice, flour, legumes, canned veggies and proteins," the World Central Kitchen said on X, formerly Twitter.

"Our relief team is working to send as many aid boats as possible."

World Central Kitchen has teams in the besieged Gaza Strip who were "constructing a dock" to unload the cargo, Lanuza told AFP last week.

The organisers have kept the location of the landing point secret for security reasons.

Aid deliveries to Gaza by land have faced mounting obstacles, with Israel insisting on time-consuming checks on cargoes and frequent bombardments hampering distribution, aid agencies and foreign governments have said.

Israel has blamed humanitarian organisations inside Gaza for being unable to efficiently distribute aid.

The United States has said it will shore up the maritime corridor by building "temporary pier" on the Gaza coast to receive relief supplies.