Simplify query_posts

If anyone could help me simplify this code on my Template Page I’d be eternally grateful:

<?php if (is_page(‘eastern-cape’)) {
query_posts(‘cat=4&showposts=10’);
}
elseif (is_page(‘free-state’)) {
query_posts(‘cat=10&showposts=10’);
}
elseif (is_page(‘gauteng’)) {
query_posts(‘cat=13&showposts=13’);
}
elseif (is_page(‘kwazulu-natal’)) {
query_posts(‘cat=14&showposts=14’);
}
elseif (is_page(‘limpopo’)) {
query_posts(‘cat=15&showposts=15’);
}
elseif (is_page(‘mpumalanga’)) {
query_posts(‘cat=16&showposts=16’);
}
elseif (is_page(‘north-west’)) {
query_posts(‘cat=17&showposts=17’);
}
elseif (is_page(‘northern-cape’)) {
query_posts(‘cat=18&showposts=18’);
}
elseif (is_page(‘western-cape’)) {
query_posts(‘cat=19&showposts=19’);
}

?>

I was hoping to maybe just use:

<?php if (is_page(‘where this would get the current page slug’)) {
query_posts(‘cat=and this-would-get-the-current-page-ID&showposts=10’);
}

Please any help would be great. Although I could live with the 9 queries above (which are provinces of South Africa, but on another page I have to have all the cities/towns which would be hundreds……