The most heated arguments concern the price of the water Singapore buys from Malaysia and sovereignty over a small rock in the Singapore strait, known as Pedra Blanca or Pulau Batu Putih, depending on your point of view.
Elsewhere in the region, Singapore's Strait Times Index fell 0.3% and India's Sensex was down 1.5%.
South Korea's Kospi Composite fell 0.5% to 1993.34 and Singapore's Strait Times index was last up 0.4%.
South Korea's Kospi Composite ended up 0.5% at 1993.44 and Singapore's Strait Times index was last up 0.6%.
South Korea's Kospi was 0.2% lower and Singapore's Strait Times Index added 0.1%.
Asian indices fell sharply: Hong Kong's Hang Seng by 7.18%, Seoul's KOSPI by 6.87%, Bangkok's SET by 6.54%, Singapore's Strait Times by 5.5% ...
In the mid-1990s, Indonesia, Malaysia and Singapore, the three states bordering the strait, appeared to have the situation under control, with only a single incident reported in 1998.
ECONOMIST: Regional efforts to combat piracy are taking shape
Since 1994, however, a group of experts from both sides of the Strait, Hong Kong and Singapore have been working to standardize the rules by which machines in all four areas translate electronic data into a readable form.
Visibility in the Malacca Strait between Indonesia, Malaysia and Singapore one of the world's busiest shipping lanes has been greatly reduced.
ECONOMIST: Will the neighbours ever dare to penalise the polluters?
Singapore may also be playing the role of conduit between the cross-strait rivals.
And it was the nations of Singapore, Indonesia, Malaysia and Thailand that came together and began to patrol in earnest the Strait of Malacca and quelled piracy quite a bit.
WHITEHOUSE: Press Briefing with Ben Rhodes and Admiral Robert Willard
His government also hauled Singapore before two different international tribunals, over both Pedra Blanca and a Singaporean land-reclamation scheme along the Johor strait, the narrow channel separating the two countries.
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